A large-thickness high-temperature protective coating on the inner wall of a turbine outer ring and its preparation method

A technology of protective coating and large thickness, which is applied in the direction of coating, metal material coating process, fusion spraying, etc. It can solve the problems of abnormal blade tip scraping, high temperature corrosive medium erosion, long-term vibration, etc., and achieve noise reduction And the effect of heat pollution control, enhanced cohesive strength, and small velocity gradient
CN108642435BActive Publication Date: 2020-10-16GUANGDONG INST OF NEW MATERIALS
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
GUANGDONG INST OF NEW MATERIALS
Publication Date
2020-10-16

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Abstract

The invention relates to a high-thickness high-temperature protection coating for the inner wall of a turbine outer ring and a preparation method of the coating and belongs to the technical field of material surface processing. The high-thickness high-temperature protection coating includes a high-temperature alloy turbine outer ring and a coating body arranged on the inner wall of the turbine outer ring,and the coating body is made of CoNiCrAlY. The coating is uniform and compact in structure,appropriate in hardness and excellent in high-temperature protection performance. The preparation method of the high-thickness high-temperature protection coating for the inner wall of the turbine outer ring includes the steps of conducting spraying on the inner wall of the pretreated turbine outer ring at least twice,conducting destress thermal treatment and secondary sand blasting treatment on the coating body at the interval of two continuous times of spraying,and conducting vacuum heat dissipation treatment on the coating body after spraying is completed. The preparation method enhances the combination strength of the coating body and the turbine outer ring and the cohesion strength of the coating body and can significantly reduce the shedding risk of the high-thickness coating and increase the yield of the coating.
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Description

technical field

[0001] The invention relates to the technical field of material surface treatment, and in particular to a large-thickness high-temperature protective coating on the inner wall of a turbine outer ring and a preparation method thereof. Background technique

[0002] As the "heart" of an aircraft, an aero-engine can provide the aircraft with the power required for flight. It is a highly complex and sophisticated thermodynamic mechanism, and its core components include air compressors, combustion chambers, and turbines. Wherein, the turbine includes a turbine outer ring and turbine rotor blades, the rotor blades are arranged in the ring of the turbine outer ring, and the tip of the blade faces the inner wall of the turbine outer ring. As an important part of the gas flow path of the engine, the outer ring of the turbine mainly plays the role of controlling the tip clearance of the turbine during the working state. According to reports, 1 / 3 of the turbine performa...

Claims

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